Local Thermal Management in Additive Manufacturing via Topology Analysis
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Solution Overview
Problem
In additive manufacturing, achieving good adhesion between layers of thermoplastic materials is challenging, especially in unheated environments, leading to thermal degradation and deformation due to irregular surface topography and differences in thermal properties between materials.
Innovation Solution
The method employs a combination of feed forward and feedback control for local thermal management, using pre-heating along tool paths based on surface topology analysis to ensure adequate adhesion while preventing thermal degradation, utilizing sensors like infrared scanners and thermocouples to adjust heating power dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform heating is applied across the entire build surface, then layer adhesion is improved, but thermal degradation and deformation occur due to excessive heating in certain areas
Solution Approach 1:
The patent applies different heating strategies to different regions of the build surface based on local topological characteristics. The build surface is divided into zones with varying heating requirements, where concave regions receive more heating and convex regions receive less heating, preventing both poor adhesion and thermal degradation in different areas simultaneously
Solution Approach 2:
The system performs preliminary topological analysis of the build surface before material deposition and pre-heats the surface in advance of where material will be deposited. This preliminary heating action ensures the surface is at the optimal temperature for adhesion before the actual deposition occurs, preventing thermal degradation by avoiding excessive or prolonged heating
2Use of energy by moving object
If the build environment is unheated to reduce energy consumption, then energy efficiency is improved, but layer adhesion deteriorates due to insufficient temperature
Solution Approach 1:
The patent extracts the heating function from the entire build chamber environment and concentrates it only on the specific regions of the build surface where material will be deposited. This localized heating approach maintains adequate adhesion temperatures at the deposition sites while leaving the rest of the build environment unheated, thereby reducing overall energy consumption
Solution Approach 2:
The system uses the exothermic heat from the freshly deposited material itself to maintain temperature at the deposition zone, supplementing this with targeted external heating only when and where needed. This self-service approach to thermal management reduces the energy burden on external heating systems while maintaining adequate adhesion conditions
3Manufacturing precision
If complex topography is printed to achieve desired part geometry, then manufacturing precision is improved, but surface irregularities cause inconsistent heating and adhesion
Solution Approach 1:
The system performs preliminary scanning and topological analysis of the complex surface geometry before deposition begins. Based on this advance knowledge of the surface contours, the system pre-calculates and applies customized heating profiles to different regions, ensuring consistent heating and adhesion conditions across the entire complex topography rather than using uniform heating
Solution Approach 2:
The heating system dynamically adjusts its output in real-time based on the instantaneous topological features being traversed by the deposition head. As the build head moves across varying surface contours, the heating power is continuously modulated to compensate for changes in surface area, curvature, and heat dissipation characteristics, maintaining consistent thermal conditions despite geometric complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances layer bonding and prevents thermal deformation, allowing for the successful printing of complex parts with varying thermal properties without the need for a controlled thermal chamber, improving part quality and reducing post-processing requirements.
Implementation Method 1
utilizing sensors like infrared scanners and thermocouples to adjust heating power dynamically
Implementation Method 2
utilizing sensors like infrared scanners and thermocouples to adjust heating power dynamically
Implementation Method 3
pre-heating along tool paths based on surface topology analysis to ensure adequate adhesion
Data Source
AI summary
A method for 3D printing a part with an additive manufacturing system includes printing a first portion of a part in a layerwise manner and analyzing a topology of the first portion of the part. The method includes determining a tool path for printing a second portion of the part on a surface of the first portion of the part, and pre-heating the first portion of the part along the tool path as a function of the topological analysis of the first portion of the part. The method includes printing the second portion of the part along the tool path.